We built a Slack Slash Command using Glitch ExpressJS and Courier to display estimated departure times for BART stations, leveraging Jsonnet's powerful data templating capabilities to dynamically generate Block Kit elements. The command uses variables, functions, and list comprehensions to render the desired output, including images and text with specific colors and directions. We showcased the completed project in a live video demonstration and invited viewers to remix our Glitch app and create their own Slack Slash Command.